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§ 179.220-26 Stenciling.
(a) The outer shell, or the jacket if the outer shell is insulated, must be stenciled in compliance with AAR Specifications for Tank Cars, appendix C (IBR, see § 171.7 of this subchapter).
(b) Stenciling must be applied on both sides of the outer shell or jacket near the center in letters and figures at least 1
1/2 inches high to indicate the safe upper temperature limit, if applicable, for the inner tank, insulation, and the support system.